LiNi_0.85Co_0.13Al_0.02O₂ (NCA) is attractive for high capacity but faces challenges like stability and thermal runaway. To address the issues, quasi-spherical nanoscaled LiTi₂(PO₄)₃ (LTP), a fast ion conductor with a negative thermal expansion property, is synthesized and utilized to modify NCA. The effects of LTP on the performance and deformation of NCA are evaluated using multifarious methods. NCA modified with 7 wt % LTP exhibits the best performance, and its discharge capacities can retain 167.4 and 160.4 mAh g^–1 at 25 and 60 °C after 100 cycles, respectively, much higher than those of NCA. Furthermore, the structural integrity and thermal stability of NCA are significantly improved, and the Li⁺ diffusion coefficient is increased around 70.2%, while the strain and R_ct are declined about 77.3% and 65.7%, respectively. LTP and carbon (LTP@C) in situ form a shell to cover NCA particles during cycles. The electrode reaction process, interface, and mechanism are discussed. It represents a strategy to update energy materials.

中文翻译：

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通过原位形成 LiTi2（PO4）3/C 壳层促进 LiNi0.85Co0.13Al0.02O2 的循环性、倍率性能和安全性


LiNi_0.85Co_0.13Al_0.02O₂ （NCA） 对高容量很有吸引力，但面临稳定性和热失控等挑战。为了解决这些问题，合成了准球形纳米级 LiTi₂（PO₄）₃ （LTP），一种具有负热膨胀特性的快速离子导体，并用于改性 NCA。使用多种方法评估了 LTP 对 NCA 性能和变形的影响。7 wt % LTP 改性的 NCA 表现出最佳性能，其放电容量在 25 °C 和 60 °C 循环 100 次后分别能保持 167.4 和 160.4 mAh g^–1，远高于 NCA。此外，NCA 的结构完整性和热稳定性得到显著提高，Li⁺ 扩散系数提高了约 70.2%，而应变和 R_ct 分别下降了约 77.3% 和 65.7%。LTP 和碳 （LTP@C） 在原位形成一个壳，以在循环过程中覆盖 NCA 颗粒。讨论了电极反应过程、界面和机理。它代表了一种更新能源材料的策略。